Injector



2 Sheets-Sheet l. T. J. HART.

(Model.)

INJEGTOR.

NQ. 488,813. Patented Dec. 20, 1892,

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rnecgs TH: Nonms Farias 00 Horan-rua., WASHINGTON. D.

Patented Dc. 20, 1892,

NTED STATES PATENT OFFICE THOMAS J. HART, OF BUFFALO, NEW YORK, ASSIGNOR TO THE Sl-IERWOOD MANUFACTURING COMPANY, OF SAME PLACE.

|NJECTOR.

SPECIFICATION forming part of Letters Patent No. 488,313, dated December 20, 1892.

Application tiled November 9, 1892. Serial No. 451,426. (Model.)

To all whom, it may concern:

Be it known that I, THOMAS J. HART, a citizen of the UnitedStates, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Injectors, of which the following is a specification.

This invention relates to the overflow devices of injectors and has the objects to falo cilitate the openingv of the overiiow valves gid to render the parts more readily accessi- In the accompanying drawings consisting of two sheets:-Figure 1 is a longitudinal sec- I 5 tional elevation of my improved injector taken in line 1-1, Fig. 3, and showing the position of the parts after the injector is started. Fig. 2 is a top plan view ot the injector. Fig. 3 1s a horizontal section in line 2O 3-3, Fig. 1. Fig. 4. is a vertical transverse section in line 4wd, Fig. 1. Fig. 5 is a fragmentary sectional elevation on an enlarged scale of the steam valves and connecting parts. Fig. 6 is a fragmentary plan view of the primary overliow valve and the lifting pawl for operating the secondary overflow valve. Fig. 7 is a fragmentary longitudinal section on an enlarged scale, of the rear portion of the injector showing the overfiow valves open. Fig. 8 is a similar view showing the primary overliow valve closed, and

the secondary overflow valve open.

Like letters of reference refer to like parts in the several figures.

A represents the. shell or casing of the injector; B the primary steam chamber; b the steam inlet; C the secondary steam chamber; D the primary water chamber and d the water inlet.

F is the primary steam valve, and f its valve seat. f is the stem of this valve. The stem f is secured at its front end to a yoke G which slides upon a stud g and is actuated by a hand lever H, connected with the shell by a link 71,.

I is a primary steam nozzle, J the primary combining tube, and J the delivery tube whereby the water is delivered from the primary water chamber into the secondary water chamber 7c.

L represents the secondary steam nozzle provided with a valve seat Z and m is the secondary steam valve formed on the valve stem f in rear of the primary steam valve F.

n is the secondary combining tube arranged in rear of the secondary steam nozzle, and n is the secondary delivery tube formed upon the rear end of the secondary combining tube and provided at'its rear end with a tubular extension n2 which opens into the water outlet o.

The construction and operation of the parts hereinbefore described are substantially the same as those described and shown in Patent No. 474,991, granted to me May 17, 1892.

P indicates an overliow chamber arranged in the rear portion of the injector behind the secondary water chamber and p is the exit through which the water escapes from said chamber in starting the injector.

q is a primary overflow opening Jformed in the rear wall of the overflow chamber and q is a primary overtlow passage connecting the secondary water chamber with the opening q.

q2 is a cylindrical valve seat formed in the primary overflow opening q, and r is the primary overflow valve of cylindrical form arranged within the passageqopposite the valve seat q2 and controlling the admission ol'. water into the overliow chamber through the primaryoverilow opening. Theprimaryoven iiow valve is att-ached to a stem s which passes through a stuffing box s in the rear portion of the shell. The stem s is provided outside of the shell with a cross head s2 which latter is connected to the yoke and hand leve-r by links s3 so that the primary overflow valve is moved toward its seat at the same time that both steam valves are moved away from their seats, or vice versa.

T represents a secondary overflow passage surrounding the secondary delivery tube and extension n2 and tare openings formed in said extension, whereby the latter is connected with the secondary overiiow passage.

it represents a tubular neck extending down from the secondary overilow passage through the primary overiiow passage and to the overflow chamber below it.

u represents a conical valve seat formed in IOO the upper end of the necku and Mis the secondary overflow valve arranged within the secondary overow passage above the valve seat u and provided on its under side with a tubular stem ug arranged in the neel; u whereby this valve is guided. The upper end of the tubular stem is provided with openings d4 which permit the water to flow from the secondary overflow passage through the tubular stem into the overflow chamber when the valve has been raised. This valve is held down against its seat by gravity and by the pressure of the fluid in the secondary over.- flow passage bearing upon the top of the valve. This valve is inserted and removed through an opening a5 in the upper side of the shell which is closed by a screw plug a6, the extension n2 and secondary combining and delivery tubes being first removed to afford access to the valve. W'hen the valve rests upon its seat its tubular stem extends downwardly into the overflow chamber. The front end of the stem carrying the primary overfiow-valve is bifurcated and arranged in the overflow chamber as shown in Figs. l, 6, 7, and 8.

V represents a lifting pawl which is pivoted in the bifurcated end of the valve stem, and adapted to raise the secondary overflow valve and hold the same in an open position. This lifting pawl is provided in its free end, and on its upper side with a notch forming a shoulder n which is adapted to bear against the lower front portion of the edge of the tubular stem of the secondary overflow-valve and beyond said shoulder' with a finger v. When both overflow valves are closed the lifting pawl extends rearwardly from its pivot between the jaws of the valve stem and rests with its shoulder against the front side of the tubular stem of the secondary overflow valve and with its finger along the under side of said stem, as represented in Fig. l. Upon shifting the hand lever rearwardly in the direction of the arrow in Fig. l, the primary overflow valve recedes from its seat, and the shoulder of the lifting pawl bears upwardly against the lower edge of the tubular stem of the secondary overflow valve, which causes the lifting pawl to swing upwardly with its free end and raise the secondary overflow valve from its seat, as represented in Fig. S. During the rearward movement of the primary overflow valve the pivotal point of the lifting pawl is carried rearwardly, which causes the finger of the pawl to enter the stem of the secondary overflow valve. As this rearward movement of the pawl continues the shoulder of the pawl leaves the front portion of lthe valve stein and the .curved back of the pawl engages under the rear portion of the valve stem and lifts the valve still further and finally holds the valve in its highest position as represented in Fig. 7. Upon shifting the hand lever in the opposite direction, the lifting pawl swings downwardly and permits the secondary overow valve to seat itself by gravity. The downward movement of the lifting pawl is limited by a stop shoulder w, formed between the jaws of the bifurcated valve stem. 'lhe movements of the primary and secondary overflow valves are so timed with reference to the steam valves, that in shifting the hand lever to start theinjector, the primary overfiow valve is closed a short time in advance of the opening of the secondary steam valve, and the secondary overflow valve is closed a short time after the secondary steam valve is opened. When theinjector is not in operation both the steam valves are closed and both the overflow valves are open. The pressure against the secondary overow-valve, when the injector is in operation, is so great that 1t requires considerable power to open the same when it is desired to shut off the injector.

The lifting mechanism described and shown in my former Letters Patenthereinbefore referred to consisted of an inclined cam rigidly connected with the valve stem and the operation of lifting the valve was by that mechanism accomplishedl with some difficulty, probably by reason of the short movement of the valve stem which is available for the purpose. By means of the pivoted lifting pawl herein described and shown, the secondary overflow valve can be readily raised from its seat. The arrangement of the primary overflow valve in the rear wall of the overfiow chamber, and the arrangement of the secondary valve in the top of that chamber and its connection with the secondary overflow chamber by the upright tubular neck renders the arrangement of these parts very compact and convenient and renders the parts easily accessible.

I claim as my invention.

l. In an injector the combination with the overflow chamber and an overflow valve applied to said chamber, of a valve stem and a lifting pawl pivoted to said stem and engaging against the ovcriow valve, substantially as set forth.

2. In an injector, the combination with the overflow chamber and an overflow valve applied thereto, of a valve stem and a lifting pawl pivoted to said stem and provided with a shoulder adapted to bear against the valve, substantially as set forth.

3. In an injector, the combination with th overflow chamber and an overflow valve applied thereto and provided with a tubular stem of a sliding valve stem arranged underneath the tubular stem of said valve, and a lifting pawl pivoted to said sliding valve stem and provided with a shoulder adapted to bear against the underside of the tubular stem, and beyond the shoulder with a finger adapted to enter said tubular stem, substantially as set forth.

4:. In an injector, the combination with the overflow chamber, and the primary and secondary overfiow passages, of a tubular con- IOO IIO

nection extending from the secondary overoW passage through the primary overflow passage into the overflow chamber, a secondary overflow valve seated in said tubular connection, a primary ovorfiow valve seated in the rear wail of the overflow chamber, and

mechanism connecting the primary with the secondary valve, for operating the secondary valve by the movement of the primary valve, substantially as set forth. 1o Witness my hand this 5th day of Novem-V ber, 1392.`

TI-IOS. J. HART.

Witnesses:

JNO. J. BONNER, FRED. C. GEYER. 

